Re: IPv4 flag day

[Matthew Petach via NANOG <nanog () lists nanog org>]

On Thu, Jun 18, 2026 at 9:20 AM <sronan () ronan-online com> wrote:

> Honestly, if SMBs are the only ones staying on IPv4 with a /28 each, I’m
> fine with that :)

Yup!

But that's why the subject line of this thread is met with "never gonna
happen" -- because there's a *lot* of SMBs that are better off staying on
IPv4 with their /28 and a pair of upstream NAT devices.

And that's a *big* economic splash zone of collateral damage you'd be
causing, even just doing a "let's turn off IPv4 for a day".

So, hopefully people now understand why IPv4 isn't going away, and we can
stop talking about a flag day or "shut it down for a day".
Nobody wants to cause that level of economic harm for zero benefit.

Thanks!

Matt
(still have my tee-shirt from helping with the first world IPv6 day; but
pragmatic enough to understand and explain why IPv4 is never going away)
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